Mill for rolling tapered disks



A. CHRISTIANSON. MlLL FOR ROLLING TAPERED DISKS.

RPRLICATION FILED JULY 21, I920.

Patented Dec. 6, 1921.

HWEW'M g 2 SHEETS,SHEET 1- A. CHRISTIANSON.

MILL FOR ROLLING TAPERED DISKS.

APPLICATION FILED JULY 21. 1920.

1,399,333, Patented Dec. 6, 1921.

2 SHEETS-SHEET 2.

FIBZ.

PATENT OFFICE.

ARNOLD CHRISTIANSON,

OF DETROIT, MICHIGAN.

MILL FOR ROLLING TAPERED DISKS.

Application filed July 21,

To all whom it may comm-2 Be it known that I, it rennin i rim. a resident of Detroit, in the count and State of Michl have inv and useful Improvement in Mill Tapered Disks, (Case 1, of whic lowing is a specification.

The invention relates to i'olli designed particularly for con I lie cup-shaped blanks into dist-1s wine of decreasing thickness from near their central portions to their peripheries.

In my application of even date herewith, Serial No. 397,958, is described a m deep substantially cylindrical cup, ably by punching through a die or d then subjecting the walls of the cup rolling action, applied circumfere. thereof in a manner to produce the greatestreduction at the open end of the cup and gradually decreasing toward its bottom, thereby expanding the blank circuir tially, progressively through different of flare, into substantially flat disk i tapers from near its center to its periphery.

The apparatus of this application is designed particularly for converting such inetallic cups into disk form.

In the accompanying drawings Figure 1 is a plan view of the machine; and Fifi 2 a longitudinal section on the line l In the drawings 1 indicates the cup-sh 1 blank to be reduced to disk form. 2 and 3 are the reducing rolls, preferably of cal form as shown and mounted in 1 bearings with their axes converg forming therebetween the pass in which tl e wall of the cup-shaped blank is reduced, one of the rolls entering into the cup as illus trated. The rolls are so arranged as to exert the greatest reduction at-the open end of the cup, with decreasing reduction toward its bottom, and means are provided for adjusting one of the rolls so as to progressively reduce the thickness of the cup wall at its open end, as the reduction progresses. To this end the shaft of one of the rolls. such as the shaft of the roll 2, is mounted in stationary bearings 5, secured at 6 to the main frame 7 of the machine, while the shaft of r0113 is mounted in bearings 8 on an adjust- Specincation of Letters ?atent.

Patented Dec. 6, 1921.

1920. Serial No. 397,956.

able carrier 9, movable on the main frame in an arcuate path, being centered at the point 10 so that the free or smaller end of the roll 3 has very slight movement during the adjustment. The outer end of the can Her 9 is guided by the arc-shaped thrust bearing 11, provided with rollers 12 or the like for reducing friction. Any suitable means may be used for adjusting this carrier, the drawings showing a screw 13, provided with hand wheel 14. By rotating this screwv as the reduction progresses, the angular positlon of the shaft of roll 8 is varied thus bringing the base of the roll 8 closer and closer to the base of roll 2 and progressively thinning the blank at its free edge.

The rolls 2 and 3 can be driven by any suitable means, the drawings showing for this purpose pulleys 15 and 15 on the respective shafts of said rolls, for receiving belts from any suitable driving source. 6

Means are provided for holding the cup against endwise displacement from the rolls 2 and 3. The holding means illustrated comprises a disk 16 adapted to engage the bottom of the cup and preferably secured thereto by means of a washer 1'7 inside of the cup and a screw 18, passing through said washer and through a hole formed centrally in the bottom of the cup and entering the disk 16. This disk 16 is provided with ashaft 19 rotatably mounted in a bearing 20, preferably on roller bearings 21 to reduce friction, so as to allow free rotation of the cup-shaped blank. his retaining means is mounted on a carriage 22, which is longitudinally movable in the main frame 'Kbeing guided therein in suitable ways, much like the ways of a shaper carriage and adapted to be moved toward and from the rolls 2 and 3 by any suitable means, the drawings showing for this purpose a shaft 23 mounted in the main frame and provided with a hand wheel=2 i on its outer end and at its inner end with a pinion 25 engaging av rack 26 on the carriage 22. This carriage will be moved away from the rolls to receive a cupped blank, then moved toward the rolls to properly position the walls of the cupped blank between the rolls, and then remains stationary during the rolling operation.

The rolls 2 and 3 exert a rolling action circumferentially on the walls of the cupped blank 1 with the greatest reduction at the open end of the cupped blank and the amount of reduction gradually decreasing toward the bottom of the blank, where it is zero. The effect of this is to cause the cup to flare at its open end, the flaring progressively increasin as the reduction continues under the above described feeding action of the roll 3 toward the roll 2. The result is that the bottom of the cup begins to take an angular position relative to the wall which is gripped in the pass of the rolls, such angular position progressively increasing until said bottom comes substantially in line with the said wall of the cup, at which stage the cup ias been converted into a substantially flat blank. To compensate for this the retaining means 16 and its associated parts must change their position to correspond with the change of the position of the bottom of the cup as the reduction progresses. To this end the bearing 20 is formed on the upper part of a carrier 28 which has an oscillatory movement on the carriage 22, being pivotally mounted thereon, by the pivot pin 29, which is co-incident in this instance with the axis 10 about which the roll carrier 9 pivots, but in a higher plane. The outer end 30 of the carrier 28 is formed on the arc of a clrcle struck about the center and is guided by an overhanging thrust bearing 31' on the carriage 22, which hearing, or the outer portion of the carrier 28, is provided with rollers or the like 32 to reduce friction to a minimum, so that said carrier 28 automatically shifts its angular position due to the pressure exerted by the change of angular. position of the bottom of the cup-shaped blank, as above described. Atthe end of the rolling operation, that is when the blank has been converted into a substantially flat disk, .the axis of the shaft 19 oi the retaining disk 16 lies in the dotted line position shown in Fig. 1, substantially at right angles to its original position. .The carrier 28 is preferably provided with a handle for swinging said carrier back to originalposition when receiving a new blank.

The action of the apparatus described stretches the metal circumferentially of the blank, with practically no stretching or expansion radially of the completed disk, with the result that the cup-shaped blank is converted into a disk whose radius is substantiall equal to the depth of the cup, plus .oneall of the diameter-of thebottom of the cup. As a consequence the metal is not put in strain, is perfectly smooth and free from waves, and there are no radial cracks, or strains tending to produce radial cracks, such as occur when a flat blank of uniform thickness is changed to tapering thickness toward its periphery and of greater diameterthan the original blank. With the mill described there is practically no working or 5 stretching of the metal in a direction radially to the finished blank, but all of the and pinion means illustrated for moving the V carriage 22 back and forth, in order to secure a quicker movement of the carriage, where speed is desired.

I claim:

1. In an apparatus for converting metallic cups into disks, the combination of rolls arranged one to bear on the inside and the otheron the outside of the cup and receiving the cup walls therebetween, said rolls being arranged to exert the reatest rolling action on the cup walls at the open end and a gradually reducing rolling action toward the bottom thereof, and means engaging the bottom of the cup and holding the same in position between the rolls, said means being arranged to vary its angular position in relation to the pass between the rolls as the cup is progressively flared.

2. In anapparatus for converting metallic cups into disks, the combination of rolls arranged one to bear on the inside and the other on the outside of the cup and receiving the cup wallstherebetween, said rolls being arranged to exert the greatest rolling action on the cup walls at the :open end and a gradually reducing rolling action toward the bottom thereof, means engaging the bottom of the cup and holding the same in position between the rolls, said means being arranged to vary its angular position in relation to the pass between the rolls as the cup is progressively flared and means to adjust said rolls to vary the rolling pressure to a greater extent at the open end of the cup than toward its bottom.

8. In an apparatus for converting metallic cups into disks, the combination of rolls arranged one to bear on the inside and the other on the outside of the cup and receiving the cup walls therebetween, said rolls being arranged to exert the greatest rolling action on the cup walls at the open end and a gradually reducing rolling action toward the bottom thereof, and rotary means engaging the bottom of the cup and holding the same in position between the rolls, said means beting automatically movable to vary the relation of its axis to the pass-between the rolls.

4:. In an apparatus for converting metallic cups into disks, the combination of rolls ,ar ranged one to bear on the inside and the other on the outside of the cup and receiving the cup walls therebetween, said rolls being arranged to exert the greatest rolling action on the cup walls at the open end and a gradually reducing rolling action toward the bottom thereof, and means engaging the bottom of the cup and holding the same in position between the rolls, said means being automatically movable by the pressure of the cup bottom to automatically assume the position which said cup bottom takes.

5. In an apparatus for converting metallic ups into disks, the combination of rolls aranged one to bear on the inside and the other 11 the outside of the cup and receiving the up we. therebetween, said rolls being arnnged to exert the greatest rolling action on the cup walls at the open end and a gradually reducing rolling action toward the bottom thereof, and means engaging the l ettom of the cup and holding the same in position between the rolls, said means being rotatable on an axis substantially parallel to the roll pass and being automatically movable to vary its axis to a position substantially at right angles to the axis of the roll pass.

6. In an apparatus for converting metallic cup-shaped blanks into disks, the combination of rolls arranged one to bear on the inside and the. other on the outside of the cup and reducing the cup walls therebetween and arranged to exert the greatest reducing action on the cup walls at the open end and a gradually decreasing reducing action toward the bottom of the cup, and rotary means engaging the bottom of-the cup and holding the same in position between the rolls, said means being mounted on a carriage movable toward and from the rolls in the general line of their axes and being arranged to vary its angular position in relation to the pass between the rolls as the cup is progressively flared.

7. In an apparatus for converting metallic cup shaped blanks into disks, the combination of rolls arranged one to bear on the inside and the other on the outside of the cup and to reduce the cup walls therebetween and arranged to exert the greatest rolling action on the cup walls at the open end and a gradually decreasing reducing action toward the bottom thereof, means engaging the bottom of the cup to hold the same in position between the rolls, said means being -ar ranged to automatically vary its position according to the position assumed by the bottom of the cup-shaped blanks.

8. In an apparatus for converting metallic cup-shaped blanks into disks, the combination of a rotatable retainer against which the cup is held by its bottom, rolling means engaging the walls of the cup-shaped blank from the open end thereof and arranged to exert an expanding action on the walls of the cup greatest at its open end and gradually decreasing toward its bottom, means for gradually varying said expanding action as the walls of the cup decrease, and a support for said rotary retainer arranged to permit the same to shift the axis of the retainer from a position substantially parallel to the roll pass to a position substantially at right angles thereto.

In testimony whereof I have hereunto set my hand.

ARNOLD CHRISTIANSON.

Vitnesses:

LYMAN H. FRAZIER, CHARLES H. RUPPEL. 

